中国物理B ›› 2019, Vol. 28 ›› Issue (7): 77303-077303.doi: 10.1088/1674-1056/28/7/077303

所属专题: TOPICAL REVIEW — Topological semimetals

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇    下一篇

Topology of triple-point metals

Georg W. Winkler, Sobhit Singh, Alexey A. Soluyanov   

  1. 1 Microsoft Quantum, Microsoft Station Q, University of California, Santa Barbara, California 93106-6105, USA;
    2 Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA;
    3 Institute of Physics, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland;
    4 Department of Physics, St. Petersburg State University, St. Petersburg 199034, Russia
  • 收稿日期:2019-02-21 修回日期:2019-05-19 出版日期:2019-07-05 发布日期:2019-07-05
  • 通讯作者: Alexey A. Soluyanov E-mail:asoluyan@physik.uzh.ch
  • 基金资助:

    G. W. W. and A. A. S. were supported by Microsoft Research and the Swiss National Science Foundation (SNSF) through the National Competence Centers in Research MARVEL and QSIT. A. A. S. acknowledges the support of the SNSF Professorship grant. S.S. acknowledges the support from the Dr. Mohindar S. Seehra Research Award.

Topology of triple-point metals

Georg W. Winkler1, Sobhit Singh2, Alexey A. Soluyanov3,4   

  1. 1 Microsoft Quantum, Microsoft Station Q, University of California, Santa Barbara, California 93106-6105, USA;
    2 Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA;
    3 Institute of Physics, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland;
    4 Department of Physics, St. Petersburg State University, St. Petersburg 199034, Russia
  • Received:2019-02-21 Revised:2019-05-19 Online:2019-07-05 Published:2019-07-05
  • Contact: Alexey A. Soluyanov E-mail:asoluyan@physik.uzh.ch
  • Supported by:

    G. W. W. and A. A. S. were supported by Microsoft Research and the Swiss National Science Foundation (SNSF) through the National Competence Centers in Research MARVEL and QSIT. A. A. S. acknowledges the support of the SNSF Professorship grant. S.S. acknowledges the support from the Dr. Mohindar S. Seehra Research Award.

摘要:

We discuss and illustrate the appearance of topological fermions and bosons in triple-point metals where a band crossing of three electronic bands occurs close to the Fermi level. Topological bosons appear in the phonon spectrum of certain triple-point metals, depending on the mass of atoms that form the binary triple-point metal. We first provide a classification of possible triple-point electronic topological phases possible in crystalline compounds and discuss the consequences of these topological phases, seen in Fermi arcs, topological Lifshitz transitions, and transport anomalies. Then we show how the topological phase of phonon modes can be extracted and proven for relevant compounds. Finally, we show how the interplay of electronic and phononic topologies in triple-point metals puts these metallic materials into the list of the most efficient metallic thermoelectrics known to date.

关键词: topological metals, topological phonons, electronic structure, thermoelectrics

Abstract:

We discuss and illustrate the appearance of topological fermions and bosons in triple-point metals where a band crossing of three electronic bands occurs close to the Fermi level. Topological bosons appear in the phonon spectrum of certain triple-point metals, depending on the mass of atoms that form the binary triple-point metal. We first provide a classification of possible triple-point electronic topological phases possible in crystalline compounds and discuss the consequences of these topological phases, seen in Fermi arcs, topological Lifshitz transitions, and transport anomalies. Then we show how the topological phase of phonon modes can be extracted and proven for relevant compounds. Finally, we show how the interplay of electronic and phononic topologies in triple-point metals puts these metallic materials into the list of the most efficient metallic thermoelectrics known to date.

Key words: topological metals, topological phonons, electronic structure, thermoelectrics

中图分类号:  (Surface states, band structure, electron density of states)

  • 73.20.At
72.90.+y (Other topics in electronic transport in condensed matter) 63.20.D- (Phonon states and bands, normal modes, and phonon dispersion) 72.15.Jf (Thermoelectric and thermomagnetic effects)